<template>
    <div>
        <!-- 面包屑导航 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>商品分类</el-breadcrumb-item>
      </el-breadcrumb>
      <!-- 卡片视图区域 -->
      <el-card>
          <el-row>
              <el-col>
                  <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
              </el-col>
          </el-row>
          <!-- 表格 -->
          <tree-table :data="catelist" :columns="columns" :selection-type="false" :expand-type="false" :show-index="true" :index-text="'#'" border :stripe="true" :show-row-hover="false" class="tree-table">
              <!-- 是否有效 -->
              <template slot="isok" slot-scope="scope">
                  <i class="el-icon-error" v-if="scope.row.cat_delected === true" style="color: red;"></i>
                  <i class="el-icon-success" v-else style="color: rgb(32, 178, 170);"></i>
              </template>
              <!-- 排序 -->
              <template slot="order" slot-scope="scope">
                  <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
                  <el-tag type="success" size="mini" v-else-if="scope.row.cat_level === 1">二级</el-tag>
                  <el-tag type="warning" size="mini" v-else-if="scope.row.cat_level === 2">三级</el-tag>
              </template>
              <!-- 操作 -->
              <template slot="opt" slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditCateDialog(scope.row.cat_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeCateById(scope.row.cat_id)">删除</el-button>
              </template>
          </tree-table>
          <!-- 分页 -->
          <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="querInfo.pagenum" :page-sizes="[2, 3, 5, 10]" :page-size="querInfo.pagesize" layout="total, sizes, prev, pager, next, jumper" :total="total">
          </el-pagination>
      </el-card>
      <!-- 添加分类的对话框 -->
      <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
          <!-- 添加分类的表单 -->
        <el-form :model="addForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
          <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addForm.cat_name"></el-input>
          </el-form-item>
          <el-form-item label="父级分类">
          <!-- options 用来指定数据源 -->
          <!-- props 用来指定配置对象 -->
            <el-cascader expand-trigger="hover" :options="parentCateList" :props="cascaderProps" v-model="selectedKeys" @change="parentCateChanged" clearable change-on-select>
            </el-cascader>
        </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
           <el-button @click="addCateDialogVisible = false">取 消</el-button>
           <el-button type="primary" @click="addCate">确 定</el-button>
        </span>
        </el-dialog>
        <!-- 编辑 -->
      <el-dialog title="修改分类" :visible.sync="editCateDialogVisible" width="30%" @close="editCateDialogClosed">
        <el-form :model="editForm" :rules="editCateFormRules" ref="editCateFormRef" label-width="90px">
        <el-form-item label="分类名称" prop="cat_name">
        <el-input v-model="editForm.cat_name"></el-input>
        </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCateInfo">确  定</el-button>
        </span>
      </el-dialog>
    </div>
</template>
<script>
export default {
  data() {
    return {
      // 查询条件
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 商品分类的数据列表 默认为空
      catelist: [],
      // 总数据条数
      total: 0,
      // 为table指定列的定义
      columns: [{
        label: '分类名称',
        prop: 'cat_name'
      }, {
        label: '是否有效',
        type: 'template',
        template: 'isok'
      }, {
        label: '排序',
        type: 'template',
        template: 'order'
      }, {
        label: '操作',
        type: 'template',
        template: 'opt'
      }
      ],
      addCateDialogVisible: false,
      // 添加分类的表单数据对象
      addForm: {
        // 将要添加的分类的名称
        cat_name: '',
        // 父级分类的Id
        cat_pid: 0,
        // 分类的等级，默认要添加的是1级分类
        cat_level: 0
      },
      // 添加分类表单的验证规则对象
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      // 父级分类的列表
      parentCateList: [],
      // 指定级联选择器的配置对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 选中的父级分类的Id数组
      selectedKeys: [],
      editForm: {},
      editCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      editCateDialogVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories', { params: this.querInfo })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }
      // 吧数据列表 赋值给catelist
      this.catelist = res.data.result
      // 为总数据条数赋值
      this.total = res.data.total
    },
    // 监听pagesize改变事件
    handleSizeChange(newSize) {
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听pagenum的改变事件
    handleCurrentChange(newPage) {
      this.querInfo.pagenum = newPage
      this.getCateList()
    },
    showAddCateDialog() {
      // 先获取父级分类的数据列表
      this.getParentCateList()
      // 再展示出对话框
      this.addCateDialogVisible = true
    },
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类数据失败!')
      }
      this.parentCateList = res.data
    },
    // 选择项发生变化触发这个事件
    parentCateChanged() {
      // 如果 selectedKeys
      if (this.selectedKeys.length > 0) {
        this.addForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addForm.cat_level = this.selectedKeys.length
      } else {
        this.addForm.cat_pid = 0
        this.addForm.cat_level = 0
      }
    },
    // 点击按钮添加新的分类
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败!')
        }
        this.$message.success('添加分类成功!')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addForm.cat_level = 0
      this.addForm.cat_pid = 0
    },
    editCateDialogClosed() {
      this.$refs.editCateFormRef.resetFields()
    },
    async showEditCateDialog(id) {
      const { data: res } = await this.$http.get('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('获得商品分类信息失败!')
      }
      this.editForm = res.data
      this.editCateDialogVisible = true
    },
    editCateInfo() {
      this.$refs.editCateFormRef.validate(async valid => {
        if (!valid) return
        // 可以发起修改用户信息的网络请求
        const { data: res } = await this.$http.put('categories/' + this.editForm.cat_id, { cat_name: this.editForm.cat_name })
        if (res.meta.status !== 200) {
          return this.$message.error('修改分类失败!')
        }
        this.$message.success('修改分类成功!')
        // 隐藏修改用户信息的对话框
        this.editCateDialogVisible = false
        // 重新获取用户列表数据
        this.getCateList()
      })
    },
    async removeCateById(id) {
      // 弹框询问用户是否删除数据
      const confirmResult = await this.$confirm('此操作将永久删除该用户, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }
      ).catch(err => err)
      // 如果确认删除，则返回值为字符串conFirm
      // 如果取消删除，则返回值为字符串 cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除用户失败!')
      }
      this.$message.success('删除用户成功!')
      this.getCateList()
    }
  }
}
</script>
<style lang="less" scoped>
.tree-table {
    margin-top: 15px;
}
.el-cascader {
    width: 100%;
}
</style>
